[petsc-users] Streams scaling.log

[Karl Rupp]

Hi Manuel,

this looks like the wrong MPI gets used. You should see an increasing 
number of processes, e.g.

Number of MPI processes 1 Processor names  node37
Triad:         6052.3571   Rate (MB/s)
Number of MPI processes 2 Processor names  node37 node37
Triad:        9138.9376   Rate (MB/s)
Number of MPI processes 3 Processor names  node37 node37 node37
Triad:        11077.5905   Rate (MB/s)
Number of MPI processes 4 Processor names  node37 node37 node37 node37
Triad:        12055.9123   Rate (MB/s)

Best regards,
Karli



On 04/25/2018 08:26 PM, Manuel Valera wrote:
> Hi,
> 
> I'm running scaling tests on my system to check why my scaling is so 
> poor, and after following the MPIVersion guidelines my scaling.log 
> output looks like this:
> 
> Number of MPI processes 1 Processor names  node37
> Triad:        12856.9252   Rate (MB/s)
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Triad:         9138.3320   Rate (MB/s)
> Triad:         9945.0006   Rate (MB/s)
> Triad:        10480.8471   Rate (MB/s)
> Triad:        12055.4846   Rate (MB/s)
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Triad:         7394.1014   Rate (MB/s)
> Triad:         5528.9757   Rate (MB/s)
> Triad:         6052.7506   Rate (MB/s)
> Triad:         6188.5710   Rate (MB/s)
> Triad:         6944.4515   Rate (MB/s)
> Triad:         7407.1594   Rate (MB/s)
> Triad:         9508.1984   Rate (MB/s)
> Triad:        10699.7551   Rate (MB/s)
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Number of MPI processes 1 Processor names  node37
> Triad:         6682.3749   Rate (MB/s)
> Triad:         6825.3243   Rate (MB/s)
> Triad:         7217.8178   Rate (MB/s)
> Triad:         7525.1025   Rate (MB/s)
> Triad:         7882.1781   Rate (MB/s)
> Triad:         8071.1430   Rate (MB/s)
> Triad:        10341.9424   Rate (MB/s)
> Triad:        10418.4740   Rate (MB/s)
> 
> 
> Is this normal? i feel is different from what i get from an usual 
> streams test, how can i get it to work properly?
> 
> Thanks,
> 
> 
> 
>